400041091 has 2 divisors, whose sum is σ = 400041092. Its totient is φ = 400041090.

The previous prime is 400041071. The next prime is 400041101. The reversal of 400041091 is 190140004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400041091 - 2²³ = 391652483 is a prime.

It is not a weakly prime, because it can be changed into another prime (400041041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200020545 + 200020546.

It is an arithmetic number, because the mean of its divisors is an integer number (200020546).

Almost surely, 2^400041091 is an apocalyptic number.

400041091 is a deficient number, since it is larger than the sum of its proper divisors (1).

400041091 is an equidigital number, since it uses as much as digits as its factorization.

400041091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 400041091 is about 20001.0272486190. The cubic root of 400041091 is about 736.8315289539.

Adding to 400041091 its reverse (190140004), we get a palindrome (590181095).

The spelling of 400041091 in words is "four hundred million, forty-one thousand, ninety-one".